Partially recrystallized microstructures expand the strength-toughness envelope of CrCoNi medium-entropy alloy
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F24%3A00602479" target="_blank" >RIV/68081723:_____/24:00602479 - isvavai.cz</a>
Result on the web
<a href="https://www.nature.com/articles/s43246-024-00704-z" target="_blank" >https://www.nature.com/articles/s43246-024-00704-z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s43246-024-00704-z" target="_blank" >10.1038/s43246-024-00704-z</a>
Alternative languages
Result language
angličtina
Original language name
Partially recrystallized microstructures expand the strength-toughness envelope of CrCoNi medium-entropy alloy
Original language description
Engineering materials exhibit an undesirable tradeoff between strength and resistance to crack propagation (fracture toughness). Here we demonstrate how this tradeoff can be circumvented by thermo-mechanical processing that produces a partially recrystallized, heterogeneous microstructure. An equimolar CrCoNi alloy was forged at room temperature (298 K) to produce high densities of three-dimensional crystallographic defect networks. Post-deformation heat treatments caused localized recrystallization that resulted in a bimodal microstructure with hard, non-recrystallized grains and soft, recrystallized grains. In this condition, the yield strength at 298 K is 2.75x the values previously obtained for the same alloy in the fully recrystallized state while the fracture toughness remains the same. The yield strength is further enhanced at 77 K without compromising the fracture toughness. This outstanding strength-toughness combination at 77 K exceeds those reported for other metallic materials and appears to result from the composite nature of the microstructure with non-recrystallized grains providing strength and recrystallized grains enabling plasticity that dissipates stresses during crack propagation. Our findings indicate that by tuning the degree of recrystallization through thermomechanical processing techniques, it will be possible to further expand the envelope bounding the strength and toughness of a range of structural metals at engineering component scales.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20501 - Materials engineering
Result continuities
Project
<a href="/en/project/GM24-11058M" target="_blank" >GM24-11058M: Design and optimization of 3D printable oxide-dispersion-strengthened multi-principal element alloys for extreme environments</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Communications Materials
ISSN
2662-4443
e-ISSN
2662-4443
Volume of the periodical
5
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
10
Pages from-to
263
UT code for WoS article
001369679000002
EID of the result in the Scopus database
2-s2.0-85211367819